8 Tatami mats are needed to cover the floor.
Answer:
yes, it is a right triangle
Step-by-step explanation:
the other two angles are 35 and 55 degrees
The probability of multiple events happening is found by multiplying the probabilities of each event together.

So yes, 1/10 is the answer :)
Cool, but we need more information...
According to the fundemintal counting princable the answer is 18.